By Eric Gigu?re
An in-depth educational on the way to use Java 2 Micro variation to software hand held units even if Java is likely one of the most well-liked programming languages, it truly is too strong for use on instant, hand-held units just like the Palm attached Organizer. A miniature model of Java, referred to as Java 2 Micro variation, has now been created via sunlight Microsystems to run in particular on those units. Written by means of software program developer Eric Giguere, this booklet offers an authoritative remedy of this new language. Readers will study what should be performed to make Java manageable on those units and what recommendations are required to write down courses that do not take in an excessive amount of reminiscence or run down the device's batteries. The e-book additionally offers whole assurance of Java Micro version, together with the profiles that outline the functions on hand to numerous units. CD-ROM comprises authorized types of the Java 2 Micro variation SDK, Waba, and Kaffe. Examples are only if run on a number of instant structures.
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4 The RIM 950 (BlackBerry) Wireless Handheld. 5 The RIM 957 Wireless Handheld. 6 The Palm portable keyboard. to be used by touch-typists. The disadvantage is that it increases the total weight and bulk of the device and requires a flat surface for correct operation (it is not really suitable for hand-held operation). 67957_Wiley_Giguere_CH01x 10/17/2000 4:49 PM Page 11 It Really Is a Small World After All 11 An alternative to a keyboard is a keypad, which is used primarily for entering numeric data.
The class loader is perhaps the simplest part of the execution engine, but it has an important part to play. Its job is to find a class and load it into memory for use by the virtual machine. There are two kinds of class loaders. The system class loader is the basic class loader supplied by the execution engine. lang package) and usually loads the application classes, unless the application supplies its own class loader. In most implementations, the system class loader loads individual class files from a file system or from an archive file (such as a JAR or ZIP file), but it could just as easily load them from read-only memory (ROM), extract them from an executable image, or pull them across a network—whatever is appropriate for a particular execution engine.
In other words, VM implementors are free to do as they choose as long as they preserve program behavior. The most common alternative implementation is to convert Java bytecodes directly to native instructions, for example. We will discuss that concept more when we explore the evolution of Java. People often make claims that Java is slow and blame this characteristic on its interpreted nature. By themselves, however, interpreters are not necessarily slow. A computer’s CPU is itself an interpreter, after all.